#include<iostream>
using namespace std;
int main(){
long long a, b, a1, a2;
int sum1=0, sum2=0, br=0;
cin>>a>>b;
if(a%9!=0) a=(a/9+1)*9;
for(;;)
{
    a1=a; a2=a*9;
    while(a1)
    {
        sum1+=a1%10;
        a1/=10;
    }
        while(a2)
    {
        sum2+=a2%10;
        a2/=10;
    }
    if(sum1==sum2) br++;
    a+=9;
    if(a>b) break;
    sum1=0; sum2=0;
}
cout<<br<<endl;
return 0;
}